Oh, ferry23, I can sympathise with you - I'm the same, reacting very badly to insect bites. I once came back from a holiday in Spain with my legs so badly bitten that the doctor thought they were burns! I still have scars from some particularly bad bites I got maybe 4o years ago.
Avon Skin So Soft used to be my 'go to', but they've changed the formula and it doesn't seem to work so well now. None of the things like hot spoons etc work for me either.
Last year, my daughter got married in Corfu and I used Pestects bracelets. I was very sceptical, but I only got two bites on one hand - and that was on the one morning I forgot to put the bracelet on. My husband, who never normally gets bitten, got quite a few bites.
I think everyone is different and it's a question of trial and error until you find what works for you.